WvW is totally broken if the INVISIBLE issue not fixed.
Yeah, I find thief perma-stealth the most annoying of any bug in the game. During the afternoons I ended up running solo, but hey if I run into an enemy thief I can expect to not be able to see him the entire fight even in a 1v1.
I wish Anet would comment on this, since there have been several threads and either I have missed an Anet comment or they refuse to comment on this bug. Unfortunately, if they are not commenting on this bug its because they probably do not have a solution for the server lag+rendering issue that leads to perma-stealth.